Hi everybody, just looking for some advice.  I'm setting up my first reef on a budget, a 27-gallon cube that I got second-hand with some equipment.  I'll be running a protein skimmer (Aquatic Life Mini) as well as an HOB filter (with floss and Chemi-Pure, I guess), and have 30-some pounds of live rock. 
I have a wrasse question.  Could you recommend any wrasses that would work for my tank?  I was thinking of the six-line, but it seems like they can get aggressive.  I'm looking for alternatives.  I'll probably have a small goby (with pistol shrimp), a clown, and perhaps a smallish wrasse.
Thanks!